[llvm] [SimplfiyLibCalls] Constant fold `remquo` (PR #99647)

[Matt Arsenault via llvm-commits]

================
@@ -0,0 +1,116 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt < %s -passes=instcombine -S | FileCheck %s
+
+define float @remquo_f32(ptr %quo) {
+; CHECK-LABEL: define float @remquo_f32(
+; CHECK-SAME: ptr [[QUO:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    store i32 -2, ptr [[QUO]], align 4
+; CHECK-NEXT:    ret float 1.000000e+00
+;
+entry:
+  %call = call float @remquof(float -5.000000e+00, float 3.000000e+00, ptr %quo)
+  ret float %call
+}
+
+define float @remquo_f32_quo_sign(ptr %quo) {
+; CHECK-LABEL: define float @remquo_f32_quo_sign(
+; CHECK-SAME: ptr [[QUO:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    store i32 2, ptr [[QUO]], align 4
+; CHECK-NEXT:    ret float -1.000000e+00
+;
+entry:
+  %call = call float @remquof(float 5.000000e+00, float 3.000000e+00, ptr %quo)
+  ret float %call
+}
+
+define float @remquo_f32_round(ptr %quo) {
+; CHECK-LABEL: define float @remquo_f32_round(
+; CHECK-SAME: ptr [[QUO:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    store i32 -6, ptr [[QUO]], align 4
+; CHECK-NEXT:    ret float 0xBFC9999900000000
+;
+entry:
+  %call = call float @remquof(float -5.000000e+00, float 0x3FE99999A0000000, ptr %quo)
+  ret float %call
+}
+
+define double @remquo_f64(ptr %quo) {
+; CHECK-LABEL: define double @remquo_f64(
+; CHECK-SAME: ptr [[QUO:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    store i32 -5, ptr [[QUO]], align 4
+; CHECK-NEXT:    ret double -0.000000e+00
+;
+entry:
+  %call = call double @remquo(double -5.000000e+00, double 1.000000e+00, ptr %quo)
+  ret double %call
+}
+
+define double @remquo_f80(ptr %quo) {
+; CHECK-LABEL: define double @remquo_f80(
+; CHECK-SAME: ptr [[QUO:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[CALL:%.*]] = call double @remquol(x86_fp80 0xKC001A000000000000000, x86_fp80 0xK4000C000000000000000, ptr [[QUO]])
+; CHECK-NEXT:    ret double [[CALL]]
+;
+entry:
+  %call = call double @remquol(x86_fp80 0xKC001A000000000000000, x86_fp80 0xK4000C000000000000000, ptr %quo)
+  ret double %call
+}
+
+; Negative tests
+
+define float @remquo_f32_inf_x(ptr %quo) {
+; CHECK-LABEL: define float @remquo_f32_inf_x(
+; CHECK-SAME: ptr [[QUO:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[CALL:%.*]] = call float @remquof(float 0x7FF0000000000000, float 1.000000e+00, ptr [[QUO]])
+; CHECK-NEXT:    ret float [[CALL]]
+;
+entry:
+  %call = call float @remquof(float 0x7FF0000000000000, float 1.000000e+00, ptr %quo)
+  ret float %call
+}
+
+define float @remquo_f32_zero_y(ptr %quo) {
+; CHECK-LABEL: define float @remquo_f32_zero_y(
+; CHECK-SAME: ptr [[QUO:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[CALL:%.*]] = call float @remquof(float -5.000000e+00, float 0.000000e+00, ptr [[QUO]])
+; CHECK-NEXT:    ret float [[CALL]]
+;
+entry:
+  %call = call float @remquof(float -5.000000e+00, float 0.000000e+00, ptr %quo)
+  ret float %call
+}
+
+define float @remquo_f32_nan_x(ptr %quo) {
+; CHECK-LABEL: define float @remquo_f32_nan_x(
+; CHECK-SAME: ptr [[QUO:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[CALL:%.*]] = call float @remquof(float 0x7FF8000000000000, float 1.000000e+00, ptr [[QUO]])
+; CHECK-NEXT:    ret float [[CALL]]
+;
+entry:
+  %call = call float @remquof(float 0x7FF8000000000000, float 1.000000e+00, ptr %quo)
+  ret float %call
+}
+
+define float @remquo_f32_nan_y(ptr %quo) {
+; CHECK-LABEL: define float @remquo_f32_nan_y(
+; CHECK-SAME: ptr [[QUO:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[CALL:%.*]] = call float @remquof(float 1.000000e+00, float 0x7FF8000000000000, ptr [[QUO]])
+; CHECK-NEXT:    ret float [[CALL]]
+;
+entry:
+  %call = call float @remquof(float 1.000000e+00, float 0x7FF8000000000000, ptr %quo)
+  ret float %call
+}
+
+declare float @remquof(float, float, ptr)
+declare double @remquo(double, double, ptr)
+declare x86_fp80 @remquol(x86_fp80, x86_fp80, ptr)
----------------
arsenm wrote:

Test the fp128 and ppcfp128 long double cases? 

https://github.com/llvm/llvm-project/pull/99647