[WebAssembly] Saturating float to int intrinsics

Summary:
Although the saturating float to int instructions are already
emitted from normal IR, the fpto{s,u}i instructions produce poison
values if the argument cannot fit in the result type. These intrinsics
are therefore necessary to get guaranteed defined saturating behavior.

Reviewers: aheejin, dschuff

Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits

Differential Revision: https://reviews.llvm.org/D53004

llvm-svn: 344204

1 files changed, 88 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/WebAssembly/conv.ll b/llvm/test/CodeGen/WebAssembly/conv.ll
index bd3ae29e28e..ea1ef9737c0 100644
--- a/llvm/test/CodeGen/WebAssembly/conv.ll
+++ b/llvm/test/CodeGen/WebAssembly/conv.ll
@@ -45,6 +45,17 @@ define i32 @i32_trunc_s_f32(float %x) {
   ret i32 %a
 }
 
+; CHECK-LABEL: i32_trunc_sat_s_f32:
+; CHECK-NEXT: .param f32{{$}}
+; CHECK-NEXT: .result i32{{$}}
+; CHECK-NEXT: i32.trunc_s:sat/f32 $push[[NUM:[0-9]+]]=, $0{{$}}
+; CHECK-NEXT: return $pop[[NUM]]{{$}}
+declare i32 @llvm.wasm.trunc.saturate.signed.i32.f32(float)
+define i32 @i32_trunc_sat_s_f32(float %x) {
+  %a = call i32 @llvm.wasm.trunc.saturate.signed.i32.f32(float %x)
+  ret i32 %a
+}
+
 ; CHECK-LABEL: i32_trunc_u_f32:
 ; CHECK-NEXT: .param f32{{$}}
 ; CHECK-NEXT: .result i32{{$}}
@@ -55,6 +66,17 @@ define i32 @i32_trunc_u_f32(float %x) {
   ret i32 %a
 }
 
+; CHECK-LABEL: i32_trunc_sat_u_f32:
+; CHECK-NEXT: .param f32{{$}}
+; CHECK-NEXT: .result i32{{$}}
+; CHECK-NEXT: i32.trunc_u:sat/f32 $push[[NUM:[0-9]+]]=, $0{{$}}
+; CHECK-NEXT: return $pop[[NUM]]{{$}}
+declare i32 @llvm.wasm.trunc.saturate.unsigned.i32.f32(float)
+define i32 @i32_trunc_sat_u_f32(float %x) {
+  %a = call i32 @llvm.wasm.trunc.saturate.unsigned.i32.f32(float %x)
+  ret i32 %a
+}
+
 ; CHECK-LABEL: i32_trunc_s_f64:
 ; CHECK-NEXT: .param f64{{$}}
 ; CHECK-NEXT: .result i32{{$}}
@@ -65,6 +87,17 @@ define i32 @i32_trunc_s_f64(double %x) {
   ret i32 %a
 }
 
+; CHECK-LABEL: i32_trunc_sat_s_f64:
+; CHECK-NEXT: .param f64{{$}}
+; CHECK-NEXT: .result i32{{$}}
+; CHECK-NEXT: i32.trunc_s:sat/f64 $push[[NUM:[0-9]+]]=, $0{{$}}
+; CHECK-NEXT: return $pop[[NUM]]{{$}}
+declare i32 @llvm.wasm.trunc.saturate.signed.i32.f64(double)
+define i32 @i32_trunc_sat_s_f64(double %x) {
+  %a = call i32 @llvm.wasm.trunc.saturate.signed.i32.f64(double %x)
+  ret i32 %a
+}
+
 ; CHECK-LABEL: i32_trunc_u_f64:
 ; CHECK-NEXT: .param f64{{$}}
 ; CHECK-NEXT: .result i32{{$}}
@@ -75,6 +108,17 @@ define i32 @i32_trunc_u_f64(double %x) {
   ret i32 %a
 }
 
+; CHECK-LABEL: i32_trunc_sat_u_f64:
+; CHECK-NEXT: .param f64{{$}}
+; CHECK-NEXT: .result i32{{$}}
+; CHECK-NEXT: i32.trunc_u:sat/f64 $push[[NUM:[0-9]+]]=, $0{{$}}
+; CHECK-NEXT: return $pop[[NUM]]{{$}}
+declare i32 @llvm.wasm.trunc.saturate.unsigned.i32.f64(double)
+define i32 @i32_trunc_sat_u_f64(double %x) {
+  %a = call i32 @llvm.wasm.trunc.saturate.unsigned.i32.f64(double %x)
+  ret i32 %a
+}
+
 ; CHECK-LABEL: i64_trunc_s_f32:
 ; CHECK-NEXT: .param f32{{$}}
 ; CHECK-NEXT: .result i64{{$}}
@@ -85,6 +129,17 @@ define i64 @i64_trunc_s_f32(float %x) {
   ret i64 %a
 }
 
+; CHECK-LABEL: i64_trunc_sat_s_f32:
+; CHECK-NEXT: .param f32{{$}}
+; CHECK-NEXT: .result i64{{$}}
+; CHECK-NEXT: i64.trunc_s:sat/f32 $push[[NUM:[0-9]+]]=, $0{{$}}
+; CHECK-NEXT: return $pop[[NUM]]{{$}}
+declare i64 @llvm.wasm.trunc.saturate.signed.i64.f32(float)
+define i64 @i64_trunc_sat_s_f32(float %x) {
+  %a = call i64 @llvm.wasm.trunc.saturate.signed.i64.f32(float %x)
+  ret i64 %a
+}
+
 ; CHECK-LABEL: i64_trunc_u_f32:
 ; CHECK-NEXT: .param f32{{$}}
 ; CHECK-NEXT: .result i64{{$}}
@@ -95,6 +150,17 @@ define i64 @i64_trunc_u_f32(float %x) {
   ret i64 %a
 }
 
+; CHECK-LABEL: i64_trunc_sat_u_f32:
+; CHECK-NEXT: .param f32{{$}}
+; CHECK-NEXT: .result i64{{$}}
+; CHECK-NEXT: i64.trunc_u:sat/f32 $push[[NUM:[0-9]+]]=, $0{{$}}
+; CHECK-NEXT: return $pop[[NUM]]{{$}}
+declare i64 @llvm.wasm.trunc.saturate.unsigned.i64.f32(float)
+define i64 @i64_trunc_sat_u_f32(float %x) {
+  %a = call i64 @llvm.wasm.trunc.saturate.unsigned.i64.f32(float %x)
+  ret i64 %a
+}
+
 ; CHECK-LABEL: i64_trunc_s_f64:
 ; CHECK-NEXT: .param f64{{$}}
 ; CHECK-NEXT: .result i64{{$}}
@@ -105,6 +171,17 @@ define i64 @i64_trunc_s_f64(double %x) {
   ret i64 %a
 }
 
+; CHECK-LABEL: i64_trunc_sat_s_f64:
+; CHECK-NEXT: .param f64{{$}}
+; CHECK-NEXT: .result i64{{$}}
+; CHECK-NEXT: i64.trunc_s:sat/f64 $push[[NUM:[0-9]+]]=, $0{{$}}
+; CHECK-NEXT: return $pop[[NUM]]{{$}}
+declare i64 @llvm.wasm.trunc.saturate.signed.i64.f64(double)
+define i64 @i64_trunc_sat_s_f64(double %x) {
+  %a = call i64 @llvm.wasm.trunc.saturate.signed.i64.f64(double %x)
+  ret i64 %a
+}
+
 ; CHECK-LABEL: i64_trunc_u_f64:
 ; CHECK-NEXT: .param f64{{$}}
 ; CHECK-NEXT: .result i64{{$}}
@@ -115,6 +192,17 @@ define i64 @i64_trunc_u_f64(double %x) {
   ret i64 %a
 }
 
+; CHECK-LABEL: i64_trunc_sat_u_f64:
+; CHECK-NEXT: .param f64{{$}}
+; CHECK-NEXT: .result i64{{$}}
+; CHECK-NEXT: i64.trunc_u:sat/f64 $push[[NUM:[0-9]+]]=, $0{{$}}
+; CHECK-NEXT: return $pop[[NUM]]{{$}}
+declare i64 @llvm.wasm.trunc.saturate.unsigned.i64.f64(double)
+define i64 @i64_trunc_sat_u_f64(double %x) {
+  %a = call i64 @llvm.wasm.trunc.saturate.unsigned.i64.f64(double %x)
+  ret i64 %a
+}
+
 ; CHECK-LABEL: f32_convert_s_i32:
 ; CHECK-NEXT: .param i32{{$}}
 ; CHECK-NEXT: .result f32{{$}}