From bfd172999be779cb441f40472f97646e4f73c2e7 Mon Sep 17 00:00:00 2001
From: Sanjay Patel <spatel@rotateright.com>
Date: Tue, 22 Jun 2021 13:42:01 -0400
Subject: [PATCH] [InstCombine][test] add tests for FP min/max with negated op;
 NFC

---
 llvm/test/Transforms/InstCombine/maximum.ll | 35 +++++++++++++++++++++
 llvm/test/Transforms/InstCombine/minimum.ll | 35 +++++++++++++++++++++
 2 files changed, 70 insertions(+)

diff --git a/llvm/test/Transforms/InstCombine/maximum.ll b/llvm/test/Transforms/InstCombine/maximum.ll
index 1a0dfa11cfbb..70bf6a922857 100644
--- a/llvm/test/Transforms/InstCombine/maximum.ll
+++ b/llvm/test/Transforms/InstCombine/maximum.ll
@@ -411,3 +411,38 @@ define float @reduce_precision_fmf(float %x, float %y) {
   %trunc = fptrunc double %maximum to float
   ret float %trunc
 }
+
+define float @negated_op(float %x) {
+; CHECK-LABEL: @negated_op(
+; CHECK-NEXT:    [[NEGX:%.*]] = fneg float [[X:%.*]]
+; CHECK-NEXT:    [[R:%.*]] = call float @llvm.maximum.f32(float [[X]], float [[NEGX]])
+; CHECK-NEXT:    ret float [[R]]
+;
+  %negx = fneg float %x
+  %r = call float @llvm.maximum.f32(float %x, float %negx)
+  ret float %r
+}
+
+define <2 x double> @negated_op_fmf_commute_vec(<2 x double> %x) {
+; CHECK-LABEL: @negated_op_fmf_commute_vec(
+; CHECK-NEXT:    [[NEGX:%.*]] = fneg <2 x double> [[X:%.*]]
+; CHECK-NEXT:    [[R:%.*]] = call nnan ninf nsz <2 x double> @llvm.maximum.v2f64(<2 x double> [[NEGX]], <2 x double> [[X]])
+; CHECK-NEXT:    ret <2 x double> [[R]]
+;
+  %negx = fneg <2 x double> %x
+  %r = call nsz nnan ninf <2 x double> @llvm.maximum.v2f64(<2 x double> %negx, <2 x double> %x)
+  ret <2 x double> %r
+}
+
+define float @negated_op_extra_use(float %x) {
+; CHECK-LABEL: @negated_op_extra_use(
+; CHECK-NEXT:    [[NEGX:%.*]] = fneg float [[X:%.*]]
+; CHECK-NEXT:    call void @use(float [[NEGX]])
+; CHECK-NEXT:    [[R:%.*]] = call float @llvm.maximum.f32(float [[NEGX]], float [[X]])
+; CHECK-NEXT:    ret float [[R]]
+;
+  %negx = fneg float %x
+  call void @use(float %negx)
+  %r = call float @llvm.maximum.f32(float %negx, float %x)
+  ret float %r
+}
diff --git a/llvm/test/Transforms/InstCombine/minimum.ll b/llvm/test/Transforms/InstCombine/minimum.ll
index cc2fe28af452..2c12792713b7 100644
--- a/llvm/test/Transforms/InstCombine/minimum.ll
+++ b/llvm/test/Transforms/InstCombine/minimum.ll
@@ -436,3 +436,38 @@ define float @reduce_precision_fmf(float %x, float %y) {
   %trunc = fptrunc double %minimum to float
   ret float %trunc
 }
+
+define float @negated_op(float %x) {
+; CHECK-LABEL: @negated_op(
+; CHECK-NEXT:    [[NEGX:%.*]] = fneg float [[X:%.*]]
+; CHECK-NEXT:    [[R:%.*]] = call float @llvm.minimum.f32(float [[X]], float [[NEGX]])
+; CHECK-NEXT:    ret float [[R]]
+;
+  %negx = fneg float %x
+  %r = call float @llvm.minimum.f32(float %x, float %negx)
+  ret float %r
+}
+
+define <2 x double> @negated_op_fmf_commute_vec(<2 x double> %x) {
+; CHECK-LABEL: @negated_op_fmf_commute_vec(
+; CHECK-NEXT:    [[NEGX:%.*]] = fneg <2 x double> [[X:%.*]]
+; CHECK-NEXT:    [[R:%.*]] = call nnan ninf nsz <2 x double> @llvm.minimum.v2f64(<2 x double> [[NEGX]], <2 x double> [[X]])
+; CHECK-NEXT:    ret <2 x double> [[R]]
+;
+  %negx = fneg <2 x double> %x
+  %r = call nsz nnan ninf <2 x double> @llvm.minimum.v2f64(<2 x double> %negx, <2 x double> %x)
+  ret <2 x double> %r
+}
+
+define double @negated_op_extra_use(double %x) {
+; CHECK-LABEL: @negated_op_extra_use(
+; CHECK-NEXT:    [[NEGX:%.*]] = fneg double [[X:%.*]]
+; CHECK-NEXT:    call void @use(double [[NEGX]])
+; CHECK-NEXT:    [[R:%.*]] = call double @llvm.minimum.f64(double [[NEGX]], double [[X]])
+; CHECK-NEXT:    ret double [[R]]
+;
+  %negx = fneg double %x
+  call void @use(double %negx)
+  %r = call double @llvm.minimum.f64(double %negx, double %x)
+  ret double %r
+}