diff --git a/lib/compiler_rt/ceil.zig b/lib/compiler_rt/ceil.zig
index 881a5a6470..ff78f47839 100644
--- a/lib/compiler_rt/ceil.zig
+++ b/lib/compiler_rt/ceil.zig
@@ -48,14 +48,14 @@ pub fn ceilf(x: f32) callconv(.C) f32 {
         if (u & m == 0) {
             return x;
         }
-        mem.doNotOptimizeAway(x + 0x1.0p120);
+        if (common.want_float_exceptions) mem.doNotOptimizeAway(x + 0x1.0p120);
         if (u >> 31 == 0) {
             u += m;
         }
         u &= ~m;
         return @bitCast(u);
     } else {
-        mem.doNotOptimizeAway(x + 0x1.0p120);
+        if (common.want_float_exceptions) mem.doNotOptimizeAway(x + 0x1.0p120);
         if (u >> 31 != 0) {
             return -0.0;
         } else {
@@ -82,7 +82,7 @@ pub fn ceil(x: f64) callconv(.C) f64 {
     }
 
     if (e <= 0x3FF - 1) {
-        mem.doNotOptimizeAway(y);
+        if (common.want_float_exceptions) mem.doNotOptimizeAway(y);
         if (u >> 63 != 0) {
             return -0.0;
         } else {
@@ -116,7 +116,7 @@ pub fn ceilq(x: f128) callconv(.C) f128 {
     }
 
     if (e <= 0x3FFF - 1) {
-        mem.doNotOptimizeAway(y);
+        if (common.want_float_exceptions) mem.doNotOptimizeAway(y);
         if (u >> 127 != 0) {
             return -0.0;
         } else {
diff --git a/lib/compiler_rt/common.zig b/lib/compiler_rt/common.zig
index 38088de7a0..f3c8260665 100644
--- a/lib/compiler_rt/common.zig
+++ b/lib/compiler_rt/common.zig
@@ -24,6 +24,8 @@ pub const want_aeabi = switch (builtin.abi) {
 };
 pub const want_ppc_abi = builtin.cpu.arch.isPPC() or builtin.cpu.arch.isPPC64();
 
+pub const want_float_exceptions = !builtin.cpu.arch.isWasm();
+
 // Libcalls that involve u128 on Windows x86-64 are expected by LLVM to use the
 // calling convention of @Vector(2, u64), rather than what's standard.
 pub const want_windows_v2u64_abi = builtin.os.tag == .windows and builtin.cpu.arch == .x86_64 and @import("builtin").object_format != .c;
diff --git a/lib/compiler_rt/cos.zig b/lib/compiler_rt/cos.zig
index 2248a68230..62d6320d1b 100644
--- a/lib/compiler_rt/cos.zig
+++ b/lib/compiler_rt/cos.zig
@@ -41,7 +41,7 @@ pub fn cosf(x: f32) callconv(.C) f32 {
     if (ix <= 0x3f490fda) { // |x| ~<= pi/4
         if (ix < 0x39800000) { // |x| < 2**-12
             // raise inexact if x != 0
-            mem.doNotOptimizeAway(x + 0x1p120);
+            if (common.want_float_exceptions) mem.doNotOptimizeAway(x + 0x1p120);
             return 1.0;
         }
         return trig.__cosdf(x);
@@ -92,7 +92,7 @@ pub fn cos(x: f64) callconv(.C) f64 {
     if (ix <= 0x3fe921fb) {
         if (ix < 0x3e46a09e) { // |x| < 2**-27 * sqrt(2)
             // raise inexact if x!=0
-            mem.doNotOptimizeAway(x + 0x1p120);
+            if (common.want_float_exceptions) mem.doNotOptimizeAway(x + 0x1p120);
             return 1.0;
         }
         return trig.__cos(x, 0);
diff --git a/lib/compiler_rt/exp.zig b/lib/compiler_rt/exp.zig
index 4bcb0cb5f0..282ee5db9a 100644
--- a/lib/compiler_rt/exp.zig
+++ b/lib/compiler_rt/exp.zig
@@ -59,7 +59,7 @@ pub fn expf(x_: f32) callconv(.C) f32 {
             return x * 0x1.0p127;
         }
         if (sign != 0) {
-            mem.doNotOptimizeAway(-0x1.0p-149 / x); // overflow
+            if (common.want_float_exceptions) mem.doNotOptimizeAway(-0x1.0p-149 / x); // overflow
             // x <= -103.972084
             if (hx >= 0x42CFF1B5) {
                 return 0;
@@ -91,7 +91,7 @@ pub fn expf(x_: f32) callconv(.C) f32 {
         hi = x;
         lo = 0;
     } else {
-        mem.doNotOptimizeAway(0x1.0p127 + x); // inexact
+        if (common.want_float_exceptions) mem.doNotOptimizeAway(0x1.0p127 + x); // inexact
         return 1 + x;
     }
 
@@ -142,7 +142,7 @@ pub fn exp(x_: f64) callconv(.C) f64 {
         }
         if (x < -708.39641853226410622) {
             // underflow if x != -inf
-            // mem.doNotOptimizeAway(@as(f32, -0x1.0p-149 / x));
+            // if (common.want_float_exceptions) mem.doNotOptimizeAway(@as(f32, -0x1.0p-149 / x));
             if (x < -745.13321910194110842) {
                 return 0;
             }
@@ -175,7 +175,7 @@ pub fn exp(x_: f64) callconv(.C) f64 {
         lo = 0;
     } else {
         // inexact if x != 0
-        // mem.doNotOptimizeAway(0x1.0p1023 + x);
+        // if (common.want_float_exceptions) mem.doNotOptimizeAway(0x1.0p1023 + x);
         return 1 + x;
     }
 
diff --git a/lib/compiler_rt/exp2.zig b/lib/compiler_rt/exp2.zig
index f094f93328..450eab201f 100644
--- a/lib/compiler_rt/exp2.zig
+++ b/lib/compiler_rt/exp2.zig
@@ -55,7 +55,7 @@ pub fn exp2f(x: f32) callconv(.C) f32 {
         // x < -126
         if (u >= 0x80000000) {
             if (u >= 0xC3160000 or u & 0x000FFFF != 0) {
-                mem.doNotOptimizeAway(-0x1.0p-149 / x);
+                if (common.want_float_exceptions) mem.doNotOptimizeAway(-0x1.0p-149 / x);
             }
             // x <= -150
             if (u >= 0x3160000) {
@@ -120,7 +120,7 @@ pub fn exp2(x: f64) callconv(.C) f64 {
         if (ux >> 63 != 0) {
             // underflow
             if (x <= -1075 or x - 0x1.0p52 + 0x1.0p52 != x) {
-                mem.doNotOptimizeAway(@as(f32, @floatCast(-0x1.0p-149 / x)));
+                if (common.want_float_exceptions) mem.doNotOptimizeAway(@as(f32, @floatCast(-0x1.0p-149 / x)));
             }
             if (x <= -1075) {
                 return 0;
diff --git a/lib/compiler_rt/floor.zig b/lib/compiler_rt/floor.zig
index a2614c8047..f9d8075be9 100644
--- a/lib/compiler_rt/floor.zig
+++ b/lib/compiler_rt/floor.zig
@@ -45,13 +45,13 @@ pub fn __floorh(x: f16) callconv(.C) f16 {
         if (u & m == 0) {
             return x;
         }
-        mem.doNotOptimizeAway(x + 0x1.0p120);
+        if (common.want_float_exceptions) mem.doNotOptimizeAway(x + 0x1.0p120);
         if (u >> 15 != 0) {
             u += m;
         }
         return @bitCast(u & ~m);
     } else {
-        mem.doNotOptimizeAway(x + 0x1.0p120);
+        if (common.want_float_exceptions) mem.doNotOptimizeAway(x + 0x1.0p120);
         if (u >> 15 == 0) {
             return 0.0;
         } else {
@@ -79,13 +79,13 @@ pub fn floorf(x: f32) callconv(.C) f32 {
         if (u & m == 0) {
             return x;
         }
-        mem.doNotOptimizeAway(x + 0x1.0p120);
+        if (common.want_float_exceptions) mem.doNotOptimizeAway(x + 0x1.0p120);
         if (u >> 31 != 0) {
             u += m;
         }
         return @bitCast(u & ~m);
     } else {
-        mem.doNotOptimizeAway(x + 0x1.0p120);
+        if (common.want_float_exceptions) mem.doNotOptimizeAway(x + 0x1.0p120);
         if (u >> 31 == 0) {
             return 0.0;
         } else {
@@ -112,7 +112,7 @@ pub fn floor(x: f64) callconv(.C) f64 {
     }
 
     if (e <= 0x3FF - 1) {
-        mem.doNotOptimizeAway(y);
+        if (common.want_float_exceptions) mem.doNotOptimizeAway(y);
         if (u >> 63 != 0) {
             return -1.0;
         } else {
@@ -146,7 +146,7 @@ pub fn floorq(x: f128) callconv(.C) f128 {
     }
 
     if (e <= 0x3FFF - 1) {
-        mem.doNotOptimizeAway(y);
+        if (common.want_float_exceptions) mem.doNotOptimizeAway(y);
         if (u >> 127 != 0) {
             return -1.0;
         } else {
diff --git a/lib/compiler_rt/round.zig b/lib/compiler_rt/round.zig
index 9f91ac4bc9..3062ff76e9 100644
--- a/lib/compiler_rt/round.zig
+++ b/lib/compiler_rt/round.zig
@@ -46,7 +46,7 @@ pub fn roundf(x_: f32) callconv(.C) f32 {
         x = -x;
     }
     if (e < 0x7F - 1) {
-        mem.doNotOptimizeAway(x + f32_toint);
+        if (common.want_float_exceptions) mem.doNotOptimizeAway(x + f32_toint);
         return 0 * @as(f32, @bitCast(u));
     }
 
@@ -81,7 +81,7 @@ pub fn round(x_: f64) callconv(.C) f64 {
         x = -x;
     }
     if (e < 0x3ff - 1) {
-        mem.doNotOptimizeAway(x + f64_toint);
+        if (common.want_float_exceptions) mem.doNotOptimizeAway(x + f64_toint);
         return 0 * @as(f64, @bitCast(u));
     }
 
@@ -121,7 +121,7 @@ pub fn roundq(x_: f128) callconv(.C) f128 {
         x = -x;
     }
     if (e < 0x3FFF - 1) {
-        mem.doNotOptimizeAway(x + f128_toint);
+        if (common.want_float_exceptions) mem.doNotOptimizeAway(x + f128_toint);
         return 0 * @as(f128, @bitCast(u));
     }
 
diff --git a/lib/compiler_rt/sin.zig b/lib/compiler_rt/sin.zig
index 1155a187d3..e1e019512f 100644
--- a/lib/compiler_rt/sin.zig
+++ b/lib/compiler_rt/sin.zig
@@ -49,7 +49,7 @@ pub fn sinf(x: f32) callconv(.C) f32 {
     if (ix <= 0x3f490fda) { // |x| ~<= pi/4
         if (ix < 0x39800000) { // |x| < 2**-12
             // raise inexact if x!=0 and underflow if subnormal
-            mem.doNotOptimizeAway(if (ix < 0x00800000) x / 0x1p120 else x + 0x1p120);
+            if (common.want_float_exceptions) mem.doNotOptimizeAway(if (ix < 0x00800000) x / 0x1p120 else x + 0x1p120);
             return x;
         }
         return trig.__sindf(x);
@@ -98,7 +98,7 @@ pub fn sin(x: f64) callconv(.C) f64 {
     if (ix <= 0x3fe921fb) {
         if (ix < 0x3e500000) { // |x| < 2**-26
             // raise inexact if x != 0 and underflow if subnormal
-            mem.doNotOptimizeAway(if (ix < 0x00100000) x / 0x1p120 else x + 0x1p120);
+            if (common.want_float_exceptions) mem.doNotOptimizeAway(if (ix < 0x00100000) x / 0x1p120 else x + 0x1p120);
             return x;
         }
         return trig.__sin(x, 0.0, 0);
diff --git a/lib/compiler_rt/sincos.zig b/lib/compiler_rt/sincos.zig
index 9bfa9260d6..5d8a9a6feb 100644
--- a/lib/compiler_rt/sincos.zig
+++ b/lib/compiler_rt/sincos.zig
@@ -46,7 +46,7 @@ pub fn sincosf(x: f32, r_sin: *f32, r_cos: *f32) callconv(.C) void {
         // |x| < 2**-12
         if (ix < 0x39800000) {
             // raise inexact if x!=0 and underflow if subnormal
-            mem.doNotOptimizeAway(if (ix < 0x00100000) x / 0x1p120 else x + 0x1p120);
+            if (common.want_float_exceptions) mem.doNotOptimizeAway(if (ix < 0x00100000) x / 0x1p120 else x + 0x1p120);
             r_sin.* = x;
             r_cos.* = 1.0;
             return;
@@ -134,7 +134,7 @@ pub fn sincos(x: f64, r_sin: *f64, r_cos: *f64) callconv(.C) void {
         // if |x| < 2**-27 * sqrt(2)
         if (ix < 0x3e46a09e) {
             // raise inexact if x != 0 and underflow if subnormal
-            mem.doNotOptimizeAway(if (ix < 0x00100000) x / 0x1p120 else x + 0x1p120);
+            if (common.want_float_exceptions) mem.doNotOptimizeAway(if (ix < 0x00100000) x / 0x1p120 else x + 0x1p120);
             r_sin.* = x;
             r_cos.* = 1.0;
             return;
@@ -232,7 +232,7 @@ inline fn sincos_generic(comptime F: type, x: F, r_sin: *F, r_cos: *F) void {
         if (se < 0x3fff - math.floatFractionalBits(F) - 1) {
             // raise underflow if subnormal
             if (se == 0) {
-                mem.doNotOptimizeAway(x * 0x1p-120);
+                if (common.want_float_exceptions) mem.doNotOptimizeAway(x * 0x1p-120);
             }
             r_sin.* = x;
             // raise inexact if x!=0
diff --git a/lib/compiler_rt/tan.zig b/lib/compiler_rt/tan.zig
index ccaa5e2f02..9f1d3f82c7 100644
--- a/lib/compiler_rt/tan.zig
+++ b/lib/compiler_rt/tan.zig
@@ -51,7 +51,7 @@ pub fn tanf(x: f32) callconv(.C) f32 {
     if (ix <= 0x3f490fda) { // |x| ~<= pi/4
         if (ix < 0x39800000) { // |x| < 2**-12
             // raise inexact if x!=0 and underflow if subnormal
-            mem.doNotOptimizeAway(if (ix < 0x00800000) x / 0x1p120 else x + 0x1p120);
+            if (common.want_float_exceptions) mem.doNotOptimizeAway(if (ix < 0x00800000) x / 0x1p120 else x + 0x1p120);
             return x;
         }
         return kernel.__tandf(x, false);
@@ -89,7 +89,7 @@ pub fn tan(x: f64) callconv(.C) f64 {
     if (ix <= 0x3fe921fb) {
         if (ix < 0x3e400000) { // |x| < 2**-27
             // raise inexact if x!=0 and underflow if subnormal
-            mem.doNotOptimizeAway(if (ix < 0x00100000) x / 0x1p120 else x + 0x1p120);
+            if (common.want_float_exceptions) mem.doNotOptimizeAway(if (ix < 0x00100000) x / 0x1p120 else x + 0x1p120);
             return x;
         }
         return kernel.__tan(x, 0.0, false);
diff --git a/lib/compiler_rt/trunc.zig b/lib/compiler_rt/trunc.zig
index 247bd98286..3036fdaef4 100644
--- a/lib/compiler_rt/trunc.zig
+++ b/lib/compiler_rt/trunc.zig
@@ -47,7 +47,7 @@ pub fn truncf(x: f32) callconv(.C) f32 {
     if (u & m == 0) {
         return x;
     } else {
-        mem.doNotOptimizeAway(x + 0x1p120);
+        if (common.want_float_exceptions) mem.doNotOptimizeAway(x + 0x1p120);
         return @bitCast(u & ~m);
     }
 }
@@ -68,7 +68,7 @@ pub fn trunc(x: f64) callconv(.C) f64 {
     if (u & m == 0) {
         return x;
     } else {
-        mem.doNotOptimizeAway(x + 0x1p120);
+        if (common.want_float_exceptions) mem.doNotOptimizeAway(x + 0x1p120);
         return @bitCast(u & ~m);
     }
 }
@@ -94,7 +94,7 @@ pub fn truncq(x: f128) callconv(.C) f128 {
     if (u & m == 0) {
         return x;
     } else {
-        mem.doNotOptimizeAway(x + 0x1p120);
+        if (common.want_float_exceptions) mem.doNotOptimizeAway(x + 0x1p120);
         return @bitCast(u & ~m);
     }
 }