radeonsi: fix compilation of monolithic PS

This was totally broken. Monolithic PS is only used if FBFETCH or
interpolateAtSample are used.

When the PS prolog was built, it overwrote ctx->main_fn.

Discovered by @eefano.

Fixes: 8832a884345686e6a8b2c0c8aa7515ad3f775b9e "radeonsi: move PS LLVM code into si_shader_llvm_ps.c"
Closes: #2814

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4918>

diff --git a/src/gallium/drivers/radeonsi/si_shader_llvm_ps.c b/src/gallium/drivers/radeonsi/si_shader_llvm_ps.c
index 6e4d5d4..3ff696d 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_shader_llvm_ps.c
+++ b/src/gallium/drivers/radeonsi/si_shader_llvm_ps.c
@@ -905,6 +905,7 @@ void si_llvm_build_monolithic_ps(struct si_shader_context *ctx, struct si_shader
 {
    LLVMValueRef parts[3];
    unsigned num_parts = 0, main_index;
+   LLVMValueRef main_fn = ctx->main_fn;
 
    union si_shader_part_key prolog_key;
    si_get_ps_prolog_key(shader, &prolog_key, false);
@@ -915,7 +916,7 @@ void si_llvm_build_monolithic_ps(struct si_shader_context *ctx, struct si_shader
    }
 
    main_index = num_parts;
-   parts[num_parts++] = ctx->main_fn;
+   parts[num_parts++] = main_fn;
 
    union si_shader_part_key epilog_key;
    si_get_ps_epilog_key(shader, &epilog_key);