[llvm] [ARM] Stop gluing FP comparisons to FMSTAT (PR #116676)

[Simon Tatham via llvm-commits]

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@@ -1108,51 +1064,24 @@ define i128 @test_signed_i128_f32(float %f) nounwind {
 ; VFP-NEXT:    vldr s4, .LCPI9_1
 ; VFP-NEXT:    vcmp.f32 s2, s0
 ; VFP-NEXT:    vmrs APSR_nzcv, fpscr
-; VFP-NEXT:    vcmp.f32 s2, s4
-; VFP-NEXT:    it lt
+; VFP-NEXT:    itttt lt
 ; VFP-NEXT:    movlt r0, #0
-; VFP-NEXT:    vmrs APSR_nzcv, fpscr
-; VFP-NEXT:    vcmp.f32 s2, s2
-; VFP-NEXT:    it gt
-; VFP-NEXT:    movgt.w r0, #-1
-; VFP-NEXT:    vmrs APSR_nzcv, fpscr
-; VFP-NEXT:    vcmp.f32 s2, s0
-; VFP-NEXT:    it vs
-; VFP-NEXT:    movvs r0, #0
-; VFP-NEXT:    vmrs APSR_nzcv, fpscr
-; VFP-NEXT:    vcmp.f32 s2, s4
-; VFP-NEXT:    it lt
 ; VFP-NEXT:    movlt r1, #0
-; VFP-NEXT:    vmrs APSR_nzcv, fpscr
-; VFP-NEXT:    vcmp.f32 s2, s2
-; VFP-NEXT:    it gt
-; VFP-NEXT:    movgt.w r1, #-1
-; VFP-NEXT:    vmrs APSR_nzcv, fpscr
-; VFP-NEXT:    vcmp.f32 s2, s0
-; VFP-NEXT:    it vs
-; VFP-NEXT:    movvs r1, #0
-; VFP-NEXT:    vmrs APSR_nzcv, fpscr
-; VFP-NEXT:    vcmp.f32 s2, s4
-; VFP-NEXT:    it lt
 ; VFP-NEXT:    movlt r2, #0
-; VFP-NEXT:    vmrs APSR_nzcv, fpscr
-; VFP-NEXT:    vcmp.f32 s2, s2
-; VFP-NEXT:    it gt
-; VFP-NEXT:    movgt.w r2, #-1
-; VFP-NEXT:    vmrs APSR_nzcv, fpscr
-; VFP-NEXT:    vcmp.f32 s2, s0
-; VFP-NEXT:    it vs
-; VFP-NEXT:    movvs r2, #0
-; VFP-NEXT:    vmrs APSR_nzcv, fpscr
-; VFP-NEXT:    it lt
 ; VFP-NEXT:    movlt.w r3, #-2147483648
 ; VFP-NEXT:    vcmp.f32 s2, s4
 ; VFP-NEXT:    vmrs APSR_nzcv, fpscr
-; VFP-NEXT:    it gt
+; VFP-NEXT:    itttt gt
 ; VFP-NEXT:    mvngt r3, #-2147483648
+; VFP-NEXT:    movgt.w r2, #-1
+; VFP-NEXT:    movgt.w r1, #-1
+; VFP-NEXT:    movgt.w r0, #-1
 ; VFP-NEXT:    vcmp.f32 s2, s2
 ; VFP-NEXT:    vmrs APSR_nzcv, fpscr
-; VFP-NEXT:    it vs
+; VFP-NEXT:    itttt vs
+; VFP-NEXT:    movvs r0, #0
+; VFP-NEXT:    movvs r1, #0
+; VFP-NEXT:    movvs r2, #0
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statham-arm wrote:

Wow, this kind of thing is a _particularly_ impressive improvement!

https://github.com/llvm/llvm-project/pull/116676