[clang] Fix bug with -ffp-contract=fast-honor-pragmas (PR #104857)

[Aaron Ballman via cfe-commits]

================
@@ -0,0 +1,151 @@
+// RUN: %clang_cc1 -O3 -ffp-contract=fast-honor-pragmas -triple %itanium_abi_triple -emit-llvm -o - %s | FileCheck %s
+
+float fp_contract_on_1(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_on_1fff(
+  // CHECK: call float @llvm.fmuladd.f32(float {{.*}}, float {{.*}}, float {{.*}})
+  #pragma STDC FP_CONTRACT ON
+  return a * b + c;
+}
+
+float fp_contract_on_2(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_on_2fff(
+  // CHECK: fmul float
+  // CHECK: fadd float
+  #pragma STDC FP_CONTRACT ON
+  float t = a * b;
+  return t + c;
+}
+
+float fp_contract_off_1(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_off_1fff(
+  // CHECK: fmul float
+  // CHECK: fadd float
+  #pragma STDC FP_CONTRACT OFF
+  return a * b + c;
+}
+
+float fp_contract_off_2(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_off_2fff(
+  // CHECK: fmul float
+  // CHECK: fadd float
+  #pragma STDC FP_CONTRACT OFF
+  float t = a * b;
+  return t + c;
+}
+
+float fp_contract_default_1(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_default_1fff(
+  // CHECK: fmul contract float
+  // CHECK: fadd contract float
+  #pragma STDC FP_CONTRACT DEFAULT
+  return a * b + c;
+}
+
+float fp_contract_default_2(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_default_2fff(
+  // CHECK: fmul contract float
+  // CHECK: fadd contract float
+  #pragma STDC FP_CONTRACT DEFAULT
+  float t = a * b;
+  return t + c;
+}
+
+float fp_contract_clang_on_1(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_clang_on_1fff(
+  // CHECK: call float @llvm.fmuladd.f32(float {{.*}}, float {{.*}}, float {{.*}})
+  #pragma clang fp contract(on)
+  return a * b + c;
+}
+
+float fp_contract_clang_on_2(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_clang_on_2fff(
+  // CHECK: fmul float
+  // CHECK: fadd float
+  #pragma clang fp contract(on)
+  float t = a * b;
+  return t + c;
+}
+
+float fp_contract_clang_off_1(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_clang_off_1fff(
+  // CHECK: fmul float
+  // CHECK: fadd float
+  #pragma clang fp contract(off)
+  return a * b + c;
+}
+
+float fp_contract_clang_off_2(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_clang_off_2fff(
+  // CHECK: fmul float
+  // CHECK: fadd float
+  #pragma clang fp contract(off)
+  float t = a * b;
+  return t + c;
+}
+
+float fp_contract_clang_fast_1(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_clang_fast_1fff(
+  // CHECK: fmul contract float
+  // CHECK: fadd contract float
+  #pragma clang fp contract(fast)
+  return a * b + c;
+}
+
+float fp_contract_clang_fast_2(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_clang_fast_2fff(
+  // CHECK: fmul contract float
+  // CHECK: fadd contract float
+  #pragma clang fp contract(fast)
+  float t = a * b;
+  return t + c;
+}
+
+#pragma STDC FP_CONTRACT ON
+
+float fp_contract_global_on_1(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_global_on_1fff(
+  // CHECK: call float @llvm.fmuladd.f32(float {{.*}}, float {{.*}}, float {{.*}})
+  return a * b + c;
+}
+
+float fp_contract_global_on_2(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_global_on_2fff(
+  // CHECK: fmul float
+  // CHECK: fadd float
+  float t = a * b;
+  return t + c;
+}
+
+#pragma STDC FP_CONTRACT OFF
+
+float fp_contract_global_off_1(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_global_off_1fff(
+  // CHECK: fmul float
+  // CHECK: fadd float
+  return a * b + c;
+}
+
+float fp_contract_global_off_2(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_global_off_2fff(
+  // CHECK: fmul float
+  // CHECK: fadd float
+  float t = a * b;
+  return t + c;
+}
+
+#pragma STDC FP_CONTRACT DEFAULT
+
+float fp_contract_global_default_1(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_global_default_1fff(
+  // CHECK: fmul contract float
+  // CHECK: fadd contract float
+  return a * b + c;
+}
+
+float fp_contract_global_default_2(float a, float b, float c) {
+  // CHECK-LABEL: fp_contract_global_default_2fff(
+  // CHECK: fmul contract float
+  // CHECK: fadd contract float
+  float t = a * b;
+  return t + c;
+}
----------------
AaronBallman wrote:

And a newline here as well.

https://github.com/llvm/llvm-project/pull/104857