[{ return MRI.getType(${src0}.getReg()) == MRI.getType(${dst}.getReg()); }]),
(apply [{ Helper.replaceSingleDefInstWithReg(*${op}, ${src0}.getReg()); }])>;
+
+def fptrunc_fpext_fold : GICombineRule<
+ (defs root:$dst),
+ (match (G_FPTRUNC $dst, $src1):$op, (G_FPEXT $src1, $src0),
+ [{ return MRI.getType(${src0}.getReg()) == MRI.getType(${dst}.getReg()); }]),
+ (apply [{ Helper.replaceSingleDefInstWithReg(*${op}, ${src0}.getReg()); }])>;
+
+
def select_to_minmax: GICombineRule<
(defs root:$root, build_fn_matchinfo:$info),
(match (wip_match_opcode G_SELECT):$root,
add_sub_reg, buildvector_identity_fold,
trunc_buildvector_fold,
trunc_lshr_buildvector_fold,
- bitcast_bitcast_fold]>;
+ bitcast_bitcast_fold, fptrunc_fpext_fold]>;
def const_combines : GICombineGroup<[constant_fp_op, const_ptradd_to_i2p,
overlapping_and, mulo_by_2, mulo_by_0,
--- /dev/null
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -run-pass=amdgpu-prelegalizer-combiner -o - %s | FileCheck %s
+
+---
+name: fptrunc_fpext_s16_to_s32_to_s16
+tracksRegLiveness: true
+body: |
+ bb.0:
+ liveins: $vgpr0
+ ; CHECK-LABEL: name: fptrunc_fpext_s16_to_s32_to_s16
+ ; CHECK: liveins: $vgpr0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: %reg:_(s32) = COPY $vgpr0
+ ; CHECK-NEXT: $vgpr0 = COPY %reg(s32)
+ %reg:_(s32) = COPY $vgpr0
+ %src:_(s16) = G_TRUNC %reg
+ %fpext:_(s32) = G_FPEXT %src
+ %fptrunc:_(s16) = G_FPTRUNC %fpext
+ %anyext:_(s32) = G_ANYEXT %fptrunc
+ $vgpr0 = COPY %anyext
+...
+
+---
+name: fptrunc_fpext_s16_to_s64_to_s32
+tracksRegLiveness: true
+body: |
+ bb.0:
+ liveins: $vgpr0
+ ; CHECK-LABEL: name: fptrunc_fpext_s16_to_s64_to_s32
+ ; CHECK: liveins: $vgpr0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: %reg:_(s32) = COPY $vgpr0
+ ; CHECK-NEXT: %src:_(s16) = G_TRUNC %reg(s32)
+ ; CHECK-NEXT: %fpext:_(s64) = G_FPEXT %src(s16)
+ ; CHECK-NEXT: %fptrunc:_(s32) = G_FPTRUNC %fpext(s64)
+ ; CHECK-NEXT: $vgpr0 = COPY %fptrunc(s32)
+ %reg:_(s32) = COPY $vgpr0
+ %src:_(s16) = G_TRUNC %reg
+ %fpext:_(s64) = G_FPEXT %src
+ %fptrunc:_(s32) = G_FPTRUNC %fpext
+ $vgpr0 = COPY %fptrunc
+...
+
+---
+name: fptrunc_fpext_v2s16_to_v2s32_to_v2s16
+tracksRegLiveness: true
+body: |
+ bb.0:
+ liveins: $vgpr0
+ ; CHECK-LABEL: name: fptrunc_fpext_v2s16_to_v2s32_to_v2s16
+ ; CHECK: liveins: $vgpr0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: %src:_(<2 x s16>) = COPY $vgpr0
+ ; CHECK-NEXT: $vgpr0 = COPY %src(<2 x s16>)
+ %src:_(<2 x s16>) = COPY $vgpr0
+ %fpext:_(<2 x s32>) = G_FPEXT %src
+ %fptrunc:_(<2 x s16>) = G_FPTRUNC %fpext
+ $vgpr0 = COPY %fptrunc
+...
+
+---
+name: fptrunc_fpext_v2s16_to_v2s64_to_v2s32
+tracksRegLiveness: true
+body: |
+ bb.0:
+ liveins: $vgpr0
+ ; CHECK-LABEL: name: fptrunc_fpext_v2s16_to_v2s64_to_v2s32
+ ; CHECK: liveins: $vgpr0
+ ; CHECK-NEXT: {{ $}}
+ ; CHECK-NEXT: %src:_(<2 x s16>) = COPY $vgpr0
+ ; CHECK-NEXT: %fpext:_(<2 x s64>) = G_FPEXT %src(<2 x s16>)
+ ; CHECK-NEXT: %fptrunc:_(<2 x s32>) = G_FPTRUNC %fpext(<2 x s64>)
+ ; CHECK-NEXT: $vgpr0_vgpr1 = COPY %fptrunc(<2 x s32>)
+ %src:_(<2 x s16>) = COPY $vgpr0
+ %fpext:_(<2 x s64>) = G_FPEXT %src
+ %fptrunc:_(<2 x s32>) = G_FPTRUNC %fpext
+ $vgpr0_vgpr1 = COPY %fptrunc
+...